/*
 * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package javax.naming.event;

/**
 * Specifies the method that a listener of a <tt>NamingEvent</tt>
 * with event type of <tt>OBJECT_CHANGED</tt> must implement.
 * <p>
 * An <tt>OBJECT_CHANGED</tt> event type is fired when (the contents of)
 * an object has changed. This might mean that its attributes have been modified,
 * added, or removed, and/or that the object itself has been replaced.
 * How the object has changed can be determined by examining the
 * <tt>NamingEvent</tt>'s old and new bindings.
 * <p>
 * A listener interested in <tt>OBJECT_CHANGED</tt> event types must:
 * <ol>
 *
 * <li>Implement this interface and its method (<tt>objectChanged()</tt>)
 * <li>Implement <tt>NamingListener.namingExceptionThrown()</tt> so that
 * it will be notified of exceptions thrown while attempting to
 * collect information about the events.
 * <li>Register with the source using the source's <tt>addNamingListener()</tt>
 *    method.
 * </ol>
 * A listener that wants to be notified of namespace change events
 * should also implement the <tt>NamespaceChangeListener</tt>
 * interface.
 *
 * @author Rosanna Lee
 * @author Scott Seligman
 * @see NamingEvent
 * @see NamespaceChangeListener
 * @see EventContext
 * @see EventDirContext
 * @since 1.3
 */
public interface ObjectChangeListener extends NamingListener {

    /**
     * Called when an object has been changed.
     * <p>
     * The binding of the changed object can be obtained using
     * <tt>evt.getNewBinding()</tt>. Its old binding (before the change)
     * can be obtained using <tt>evt.getOldBinding()</tt>.
     *
     * @param evt The nonnull naming event.
     * @see NamingEvent#OBJECT_CHANGED
     */
    void objectChanged(NamingEvent evt);
}
